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The rheological behaviour of rock masses and its significance for the construction of caverns in rock
344 MECHANISM
R. W.
Poisel Eppensteiner
in F E L S B A U
6,
OF
Technical Technical
Nr.4,
A
ROCK MASS PART 1
University University
November
1988,
MOVEMENTS
of of
Vienna Vienna
- Austria - Austria
189-194
SUMMARY The mechanics of c o m p e t e n t rock masses l y i n g on a soft, i n c o m p e t e n t b a s e is i n v e s t i g a t e d . V a r i o u s m o d e s of m o v e m e n t s a n d f a i l u r e s u c h as s l i d i n g of t o w e r - o r s l a b s h a p e d r o c k b l o c k s , circular f a i l u r e in t h e b a s e m a t e r i a l and toppling are studied by means of s m a l l scale laboratory tests and finite element calculations. In t h e n u m e r i c a l a n a l y s i s t h e r h e o l o g i c a l b e h a v i o u r of t h e b a s e m a t e r i a l is t a k e n into account and gap-friction elements a r e u s e d to s i m u l a t e the frictional behaviour of t h e contact rock mass/base. Additionally, exampxes of observed behaviour in the field are shown and a short geological background of t h e d i s c u s s e d phenomena is g i v e n .
THE RHEOLOGICAL BEHAVIOUR OF ROCK MASSES AND ITS SIGNIFICANCE FOR THE CONSTRUCTION OF CAVERNS IN R O C K
M.
Bundesanstalt fuer Geowissenschaften Rohstoffe, Hannover - FRG
Langer
in F E L S B A U
6,
Nr.4
November
1988,
und
203-212
SUMMARY A realistic assessment of the time dependent material behaviour is essential for any analysis dealing with the stability of r o c k c a v e r n s . This is e s p e c i a l l y important when caverns or m i n e s a r e u s e d for r a d i o a c t i v e waste deposits. In this paper some basic considerations of c o n s t i t u t i v e modelling of r o c k s a r e b r i e f l y d i s c u s s e d and results from laboratory and i n - s i t u c r e e p t e s t s on r o c k s a l t a r e p r e s e n t e d . A s p e c i a l p u r p o s e f i n i t e e l e m e n t c o d e f o r t h e a n a l y s i s of u n d e r g r o u n d o p e n i n g s in rock salt is d e s c r i b e d . The application of the program to p r a c t i c a l p r o b l e m s is s h o w n i n c l u d i n g a l o n g t e r m d e f o r m a t i o n a n d temperature analysis for a r a d i o a c t i v e waste deposit in r o c k salt.
R. W.
Poisel Eppensteiner
in F E L S B A U
6,
OF
Technical Technical
Nr.4,
A
ROCK MASS PART 1
University University
November
1988,
MOVEMENTS
of of
Vienna Vienna
- Austria - Austria
189-194
SUMMARY The mechanics of c o m p e t e n t rock masses l y i n g on a soft, i n c o m p e t e n t b a s e is i n v e s t i g a t e d . V a r i o u s m o d e s of m o v e m e n t s a n d f a i l u r e s u c h as s l i d i n g of t o w e r - o r s l a b s h a p e d r o c k b l o c k s , circular f a i l u r e in t h e b a s e m a t e r i a l and toppling are studied by means of s m a l l scale laboratory tests and finite element calculations. In t h e n u m e r i c a l a n a l y s i s t h e r h e o l o g i c a l b e h a v i o u r of t h e b a s e m a t e r i a l is t a k e n into account and gap-friction elements a r e u s e d to s i m u l a t e the frictional behaviour of t h e contact rock mass/base. Additionally, exampxes of observed behaviour in the field are shown and a short geological background of t h e d i s c u s s e d phenomena is g i v e n .
THE RHEOLOGICAL BEHAVIOUR OF ROCK MASSES AND ITS SIGNIFICANCE FOR THE CONSTRUCTION OF CAVERNS IN R O C K
M.
Bundesanstalt fuer Geowissenschaften Rohstoffe, Hannover - FRG
Langer
in F E L S B A U
6,
Nr.4
November
1988,
und
203-212
SUMMARY A realistic assessment of the time dependent material behaviour is essential for any analysis dealing with the stability of r o c k c a v e r n s . This is e s p e c i a l l y important when caverns or m i n e s a r e u s e d for r a d i o a c t i v e waste deposits. In this paper some basic considerations of c o n s t i t u t i v e modelling of r o c k s a r e b r i e f l y d i s c u s s e d and results from laboratory and i n - s i t u c r e e p t e s t s on r o c k s a l t a r e p r e s e n t e d . A s p e c i a l p u r p o s e f i n i t e e l e m e n t c o d e f o r t h e a n a l y s i s of u n d e r g r o u n d o p e n i n g s in rock salt is d e s c r i b e d . The application of the program to p r a c t i c a l p r o b l e m s is s h o w n i n c l u d i n g a l o n g t e r m d e f o r m a t i o n a n d temperature analysis for a r a d i o a c t i v e waste deposit in r o c k salt.